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Current content: 157 117 910 patent documents

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139 301 new documents added

1 340 825 documents amended

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EP 0813315 A2 19971217 - Spread spectrum QAM transmission

Title (en)

Spread spectrum QAM transmission

Title (de)

Spreizspektrum-QAM-Übertragung

Title (fr)

Transmission MAQ à étalement de spectre

Publication

EP 0813315 A2 19971217 (EN)

Application

EP 97400900 A 19970422

Priority

FR 9607366 A 19960613

Abstract (en)

For each data element (symbol), a sequence of N points from a QAM constellation is transmitted. If the symbol period is T, then, in one embodiment, each point in the sequence has duration T/N. The sequence is determined by treating the constellation as a finite ring, and repeatedly multiplying the data point by a constant point.

IPC 1-7

H04B 1/707; H04J 11/00; H04L 27/34

IPC 8 full level

H04B 1/707 (2011.01); H04L 27/34 (2006.01); H04J 13/00 (2011.01)

CPC (source: EP US)

H04L 27/34 (2013.01 - EP US)

Designated contracting state (EPC)

DE DK ES FR GB IT NL

DOCDB simple family (publication)

EP 0813315 A2 19971217; EP 0813315 A3 19980610; JP H1070584 A 19980310; US 6084918 A 20000704

DOCDB simple family (application)

EP 97400900 A 19970422; JP 15691297 A 19970613; US 84861797 A 19970429